The nation's largest retailer is limiting ammunition sales at its stores across the country to three boxes per customer, per day.

Guns and ammunition have been flying off store shelves since President Obama's reelection in November, and the firearm rush only picked up in the wake of the tragic school shooting in Newtown, Conn., in December.

More and more people are buying up guns while they have the chance, since many are worried that their right to buy assault weapons could be curtailed with gun control legislation. The increased demand has hit Wal-Mart's ammunition supply.

"Right now we're monitoring supply issues daily, since supply is limited at this time," said Ashley Hardie, a Wal-Mart spokeswoman. "We're trying to take care of as many customers as possible and we're working with suppliers to put products back on shelves."

Hardie said that the purchase limit will stay in place until the retailer is able to resolve the shortage.